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• Multiple copies of JBoss acting as one? [migrated]

  - by scphantm

  I have a few ideas how to solve the problem, but one question about jboss clustering. Please, keep in mind these applications were written very poorly, that is why they require so much memory and there is nothing i can do about that right now. So, I have clustered applications on Jboss where the application was small enough to run on one box. Meaning that one machine could handle the load. But, the current problem is that i have been asked to run several systems on the same environment. Our machines are virtuals and due to limited hardware, are restricted to 8 GB RAM, which gives jboss about 7GB to itself. Unfortunately, that isn't enough to run the group of applications. Im constantly getting heap errors and crashes. If i cluster 2 or 3 jboss instances together, can i run applications that consume more resources than a single box can handle?

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• Is it OK to write a programming language in Jython? [closed]

  - by Christopher

  I've been looking at the tools for writing a programming language and I had a bizarre idea. What If I wrote a full blown programming language in Jython? Is that a practical solution? Will distribution and bundling be a problem? Can that make or break the language's success? In other words, I'm asking if writing a programing language written in Jython is a practical solution for production enviroments?

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• LWJGL: Camera distance from image plane?

  - by Rogem

  Let me paste some code before I ask the question... public static void createWindow(int[] args) { try { Display.setFullscreen(false); DisplayMode d[] = Display.getAvailableDisplayModes(); for (int i = 0; i < d.length; i++) { if (d[i].getWidth() == args[0] && d[i].getHeight() == args[1] && d[i].getBitsPerPixel() == 32) { displayMode = d[i]; break; } } Display.setDisplayMode(displayMode); Display.create(); } catch (Exception e) { e.printStackTrace(); System.exit(0); } } public static void initGL() { GL11.glEnable(GL11.GL_TEXTURE_2D); GL11.glShadeModel(GL11.GL_SMOOTH); GL11.glClearColor(0.0f, 0.0f, 0.0f, 0.0f); GL11.glClearDepth(1.0); GL11.glEnable(GL11.GL_DEPTH_TEST); GL11.glDepthFunc(GL11.GL_LEQUAL); GL11.glMatrixMode(GL11.GL_PROJECTION); GL11.glLoadIdentity(); GLU.gluPerspective(45.0f, (float) displayMode.getWidth() / (float) displayMode.getHeight(), 0.1f, 100.0f); GL11.glMatrixMode(GL11.GL_MODELVIEW); GL11.glHint(GL11.GL_PERSPECTIVE_CORRECTION_HINT, GL11.GL_NICEST); } So, with the camera and screen setup out of the way, I can now ask the actual question: How do I know what the camera distance is from the image plane? I also would like to know what the angle between the image plane's center normal and a line drawn from the middle of one of the edges to the camera position is. This will be used to consequently draw a vector from the camera's position through the player's click-coordinates to determine the world coordinates they clicked (or could've clicked). Also, when I set the camera coordinates, do I set the coordinates of the camera or do I set the coordinates of the image plane? Thank you for your help. EDIT: So, I managed to solve how to calculate the distance of the camera... Here's the relevant code... private static float getScreenFOV(int dim) { if (dim == 0) { float dist = (float) Math.tan((Math.PI / 2 - Math.toRadians(FOV_Y))/2) * 0.5f; float FOV_X = 2 * (float) Math.atan(getScreenRatio() * 0.5f / dist); return FOV_X; } else if (dim == 1) { return FOV_Y; } return 0; } FOV_Y is the Field of View that one defines in gluPerspective (float fovy in javadoc). This seems to be (and would logically be) for the height of the screen. Now I just need to figure out how to calculate that vector.

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• How to draw a map for the game?

  - by user36689

  I wanted to make a small game, it will be about space. But I had a couple of questions, how to draw a map for the game? I would like to have lots of planets, possible consolidation of the system (as the solar system) But how to draw these planets? Is it really necessary to draw them by hand? I plan to give the names of the planets, but maybe I will not do what is best to do? Prompt Council Help me, please) I'm sorry if that is not the case)) Thanks in advance!

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• Transforms in Box2D

  - by user1264811

  I'm attempting to implement a camera in my game. I had it working for regular objects, but I began using Box2D and obviously things changed a bit. I have a Body object that I want to draw at the center of the screen. Basically what I'm doing is subtracting the viewportX and viewportY to the Body. I use this code that currently is not working as it should: public void paint(Graphics2D g, int viewportX, int viewportY) { Transform xf = new Transform(); // m_body is the Body object xf.set(m_body.getTransform()); // Here what I attemp to do is take the transform and alter it // by the viewportX and Y, which is something like **-240, -150**. // Why is it negative? Because an object has coordinates 500, 300 would be displayed // at 160, 150 when the subtraction is done. // With the DrawUtils.toScale(), it's just how I convert the units from JBox2D units // to my units. Vec2 v = Transform.mulTrans(xf, new Vec2(DrawUtils.toScale(-viewportX), DrawUtils.toScale(-viewportY))); // Set the new transform to the new vector. Keep the old angle. xf.set(v, xf.q.getAngle()); g.setColor(Color.white); // I know for a fact that the following method works 100%. It correctly displays // my object, just that it doesn't follow it. for (Fixture f = m_body.getFixtureList(); f != null; f = f.getNext()) DrawUtils.drawShape(f, xf); } Hopefully I didn't over comment this and you understand my problem. I don't want to alter the actual physics position of the object, I just want to display it in the center.

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• Need to organize words based on their components, any other way aside from brute force?

  - by Lathan

  I'm not sure if this process has a name. I have some words (about 9,000). They are in Japanese, but I'll try to explain this using English words. I want to categorize the words by the components (in English, letters). A B C act bar play This should create: A: play B: bar C: act Now, 'a' appears in all 3 words, but I want to make sure that each category (letter) has at least word. Now, it would make sense to delete a word after it's used, but there are a few cases where 2 letters make up one word and that's each letter's only word--so I'd like to account for that somehow. Is there an approach for solving this aside from brute force? Dynamic programming perhaps? Even a name for this process (if it exists) would be great.

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• Color based collision detection

  - by user1486826

  I am making a game where you fly a ship around some randomly generated planets. Since I am using a for loop to draw over 5000 planets, using the rectangle class or an oval-type class for this is not an option, since creating many objects will severely affect performance. Bitmasking each planet will likely result in performance issues too, so the only candidate is color based collision detection, because I don't need to apply some sort of object to everything I want to check for collisions. Is any way to check the perimeter around the ship for a certain color?

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• How to have the game world get rendered on just a part of the screen?

  - by VictorB

  I am implementing a game on both Desktop and Android. The Desktop version will just rely on the keyboard to handle the user input on the game screen, whilst the Android one will have to have a set of buttons placed in a bar at the bottom of the game screen, using a Stage. Consequently, I am expecting the game world to take up the entire space available on the Desktop screen, whilst on Android it should expand to the entire width of the screen, and to the screen height minus the height of the buttons bar I've mentioned. What would be an appropriate approach of handling space sharing between the game world and the buttons bar? Thank you.

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• Distinguishing between sets of status reports

  - by user1769486

  I am working on an internal database monitoring system and am at a point where I sort of hit the wall in terms of application design. Basically I have an extensible plugin architecture where I shall have an OK, a warning or an error upon running a db verification. My first question whether it is sufficient to have only one status reported with an optional status message or provide the ability to have more than one returned (with attached messages) and then calculate an aggregated overall status. In particular in the latter case my second issue would be how to distinguish between two verification reports with the same status code (as it can come from different triggers). I would need to do this to see whether some change happened between the current and last verification. I could simply have string comparisons of the attached status messages mentioned above but that does not seem very reliable.

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• Should my game handle collisions in the Player object?

  - by user1264811

  I'm making a 2D platform game. Right now I'm just working on making a very generic Player class. I'm wondering if it would be more efficient/better practice to have an ActionListener within the Player class to detect collisions with Enemy objects (also have an ActionListener) or to handle all the collisions in the main world. Furthermore, I'm thinking ahead about how I will handle collisions with the platforms themselves. I've looked into the double boolean arrays to see which tiles players can go to and which they can't. I don't understand how to use this class and the player class at the same time.

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• Bubble sorting my array does not sort it

  - by Trixmix

  I sort an array of chunks by doing this: for (int i =0; i<this.getQueue().size();i++) { for (int j =0; j<this.getQueue().size()-i-1;j++) { Chunk temp1 = this.getQueue().get(i); Chunk temp2 = this.getQueue().get(i+1); if (temp1 != null &&temp2 != null && temp2.getLocation().getY() < temp1.getLocation().getY()) { this.getQueue().set(i, temp2); this.getQueue().set(i+1, temp1); } } } What I want is the the chunks with the lowest Y coordinate will be at the start of the array and the ones with the bigger Y coordinate will be at the end of the array. And this is my result: 1024.0 944.0 1104.0 944.0 1104.0 ----BEFORE----- 944.0 1024.0 944.0 1104.0 1104.0 ---AFTER--- Why is this not working It seams fine. I dont want to use a comparator so dont suggest it. More info, the Y cords are floats. I got the result by for each looping on this queue and printed the Y locations.

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• Ajaxion - Standalone Ajax - Part 1 of 2 - Agile, Life-cycle, Web Design, Server Side

  An article about how to build Web applications of the future relying on the current standards and less technology

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• Multiplayer in a game. How to design it object wise?

  - by Ninetou

  I was suggested on StackOverflow to ask this question here. I'm working on a simple game and I was thinking of adding multiplayer feature but I'm a bit stuck. I'm not sure what approach should I take, keeping in mind good programming practices. I have a Player object which is created for each player but then I have many other classes that would have to be able to access them. The thing is, if I initialise them in, let's say my main method, then I can't relate to different instances of player class from other classes. The only solution to my problem that comes to my mind is using some form of global objects but afaik using anything globally in apps is usually not a good practice. Any suggestions/ideas?

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• Android app, No error message but has stopped unexpectedly [migrated]

  - by user74722

  Does anyone know what is my problem. I do not have any compile error messages however when i run the app it crashes and stops unexpectedly. Here is my codes. Thank you in advance. ListView l ; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_final_project); String arr[]={"Red","Green","Blue","Yellow","Cyan"}; l=(ListView) findViewById(R.id.listView1); ArrayAdapter<String> adapter=new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1, arr); l.setAdapter(adapter); Button buttonOne = (Button) findViewById(R.id.button1); buttonOne.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v){ setContentView(R.layout.layout_save); // setContentView(R.layout.activity_final_project); //startActivity(new Intent("com.example.finalproject.layout_save")); } }); }

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• Is It More Efficient To Make Games In Languages I Like?

  - by Dsfsdfsdfsdfsd Fsdf

  Is it more "efficiant" to develop games with languages your good with and like best rather then the "best" language? A example is like I like C# (It's My First Language) and I'm really good at it and used to how it works, I'm not as good with C++ but I'm kinda slow at it because I don't prefer how you systems work like I think int a[] is not as good as int[] a. Would it be better to go with what I know best or what's the "best" available? Thanks For Reading!

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• Output the total number of String Characters [migrated]

  - by Programmerwannabe

  My Question is what method should I use if I wanted to get the total number of characters a user inputs? without using arrays, i tried using .length() but it did not return all characters say from the first and lastname, it only returned the first name. Here's an example of my code. (Please dont laugh im really new in programming :) ) System.out.print("Enter your first and last name: "); String yourName = keyboard.next(); System.out.println("Your name has a total of " + yourName.length() + " numbers"); what happened was if i enter say "Neo Matrix" it would only return 3. I appreciate any help. thank you!

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• Trouble installating openjdk6 on 12.04 LTS

  - by Lost

  I tried to install openjdk6 on 12.04 LTS, with the command: sudo apt-get install openjdk-6-jre but got the following error: Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: openjdk-6-jre : Depends: openjdk-6-jre-headless (= 6b24~pre1-1ubuntu3) but it is not going to be installed E: Unable to correct problems, you have held broken packages. Please help. Thanks!

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• Cycling through ItemStacks whlie supplying data... LOST [on hold]

  - by user3251606

  Ok so i am working on a plugin for my server that will open and inventory and when closed it will pass items to this class... object of this class is to cycle through the inventory and use a cfg file to define items and prices and then grab that info in a for loop and add it all up... heres what i have thus far... public void sell(Player p, Inventory inv) { ListIterator<ItemStack> it = inv.iterator(); double total = 0; for (ItemStack is : inv) { is = it.next(); if (is.getType() != null) { String type = is.getType().toString(); //short dur = is.getDurability(); String check = ChestSell.plugin.getConfig().getString(type); p.sendMessage("Item Type: " + type); if (check != null) { int amou = is.getAmount(); double value = ChestSell.plugin.getConfig().getDouble(type + ".price"); double tv = amou * value; p.sendMessage("Items in chest: Type " + type + " Ammount: " + amou + " Value: $" + tv); } //TODO Add return Items } } p.sendMessage("You got paid $" + total + " for your items!"); inv.clear(); }

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• Driver inversion

  - by Val

  I have a GUI game, which is driven by user every time it clicks the mouse. Every time user clicks a square on a board, the board state is updated (we re-compute the score, the player to make next move and legal movements it can make) and repainted. Both mouse click, state recomputation and painting are handled in the GUI thread. Now, suppose that I want to train AI to play without GUI. That is, game engine should consume next move by simply calling AI's makeMove function in one thread. This would allow to play millions of games per second automatically. GUI may just screenshot some arbitrary states time after time. How do you switch to this strategy?

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• Drawing chunks, and positioning the camera

  - by Troubleshoot

  I've seen many questions and answers regarding how to draw tiled maps but I can't really get my head around it. Many answers suggest either loading the visible part of the map, or loading and unloading chunks of the map. I've decided the best option would be to load chunks, but I'm slightly confused as to how this would be implemented. Currently I'm loading the full map to a 2D array of buffered images, then drawing it every time repaint is called. Q1: If I were to load chunks of the map, would I load the map as a whole then draw the necessary chunk(s), or load & unload the chunks as the player moves along, and if so, how? My second question regards the camera. I want the player to be in the centre of the X axis and the camera to follow it. I've thought of drawing everything in relation to the map and calculating the position of the camera in relation to the players coordinates on the map. So, to calculate the camera's X position I understand that I should use cameraX = playerX - (canvasWidth/2), but how should I calculate the Y position? I want the camera to only move up when the player reaches cameraHeight/2 but to move down when the player reaches 3/4(cameraHeight). Q2: Should I check for this in the same way I check for collision, and move the camera relative to the movement of the player until the player stops moving, or am I thinking about it in the wrong way?

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• Building Website with JAX-RS (Jersey)

  - by 0xMG

  Is it discouraged/not-common to build Websites (not web-services!) using Jersey or any other JAX-RS implementation ? I didn't find any guide/tutorial/article regarding that.. At first impression , it seems to me that building website using Jersey (with JSPs as Viewables) is easier and more efficient than using Servlets & JSPs. If anyone did it before , I will be pleased to get tips, Do's & Don'ts, best practices etc... And maybe a good tutorial.

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• How to remove items from an arraylist without shrinking the list [migrated]

  - by user73710

  I have a case where I am using the ArrayList to keep a list of items that are keyed by their position in the list. Other objects reference the ArrayList items by their position. If I delete one of the items from the list, I don't want the list to shrink because that would invalidate all other references to items in the list (e.g. item 2 is now in position 1). My solution to the shrinking array list problem is to null the position in the arraylist so that the list will not shrink. I am curious whether this will free the memory formerly held by the item at that position. If there is a better way to accomplish this requirement, I would like to know about it.

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• How to swap or move 2 string in Array? [on hold]

  - by Wisnu Khazefa

  I have a need to convert .csv file to .dat file. In my problem, there are value pairs, with a name attribute (called Fund) and corresponding numeric value. If the input file has a pair whose value is 0, then that pair (Fund and value) is dropped. The output file should have only those pairs (Fund and value) where the value is non-zero. Here is the prototype of my code. public static void Check_Fund(){ String header = "Text1,Text2,Text3,FUND_UALFND_1,FUND_UALPRC_1,FUND_UALFND_2," +"FUND_UALPRC_2,FUND_UALFND_3,FUND_UALPRC_3,FUND_UALFND_4,FUND_UALPRC_4,FUND_UALFND_5,FUND_UALPRC_5,Text4,Text5,Text6,Text7"; String text = "ABC;CDE;EFG;PRMF;0;PRFF;50;PREF;0;PRCF;0;PRMP;50;TAHU;;BAKWAN;SINGKONG"; String[] head; String[] value; String showText = ""; head = header.split(","); value = text.split(";"); String regex = "\\d+"; String[] fund = {"PREF","PRMF","PRFF","PRCF","PRMP","PDFF","PSEF","PSCB","PSMF","PRGC","PREP"}; for(int i = 0; i < value.length; i++){ for(int j=0;j < fund.length; j++){ if(value[i].equals(fund[j]) && value[i+1].matches(regex)){ if(value[i+1].equals("0")){ value[i] = ""; value[i+1] = ""; } } } showText = showText + head[i] +":" + value[i] + System.lineSeparator(); } System.out.println(showText ); } Expected Result Input: FUND_UALFND_1:PRMF FUND_UALPRC_1:0 FUND_UALFND_2:PRFF FUND_UALPRC_2:50 FUND_UALFND_3:PREF FUND_UALPRC_3:0 FUND_UALFND_4:PRCF FUND_UALPRC_4:0 FUND_UALFND_5:PRMP FUND_UALPRC_5:50 Output: FUND_UALFND_1:PRFF FUND_UALPRC_1:50 FUND_UALFND_2:PRMP FUND_UALPRC_2:50 FUND_UALFND_0: FUND_UALPRC_0: FUND_UALFND_0: FUND_UALPRC_0: FUND_UALFND_0: FUND_UALPRC_0:

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• j2me Bitmap font

  - by user1494517

  Well i have found a tutorial how to make a bitmap font from an image. (http://devlinslab.blogspot.com/2007/11/using-custom-fonts-or-bitmap-fonts-part.html). So I have used this code in my game and the problem is that the rest of the graphics which should be seen on the screen like rectangles and etc. is invisible. Before the newly added code http://i47.tinypic.com/30wt5ad.jpg After http://i48.tinypic.com/3581k44.jpg

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• Should I amortize scripting cost via bytecode analysis or multithreading?

  - by user18983

  I'm working on a game sort of thing where users can write arbitrary code for individual agents, and I'm trying to decide the best way to divide up computation time. The simplest option would be to give each agent a set amount of time and skip their turn if it elapses without an action being decided upon, but I would like people to be able to write their agents decision functions without having to think too much about how long its taking unless they really want to. The two approaches I'm considering are giving each agent a set number of bytecode instructions (taking cost into account) each timestep, and making players deal with the consequences of the game state changing between blocks of computation (as with Battlecode) or giving each agent it's own thread and giving each thread equal time on the processor. I'm about equally knowledgeable on both concurrency and bytecode stuff, which is to say not very, so I'm wondering which approach would be best. I have a clearer idea of how I'd structure things if I used bytecode, but less certainty about how to actually implement the analysis. I'm pretty sure I can work up a concurrency based system without much trouble, but I worry it will be messier with more overhead and will add unnecessary complexity to the project.

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